#water_totalArea{
    position: absolute;
    z-index: 888;
    top: 20px;
    width: auto;
    padding: 0 10px;
    height: 30px;
    color: #fff;
    margin-left: 50%;
    transform: translate(-50%,0);
    background: rgba(33,33,33,.8);
    text-align: center;
    line-height: 30px;
}